28V Internal Switch LCD Bias Supply with True Shutdown™

The MAX1606 is a step-up DC-DC converter that contains a 0.5A internal power switch and a 0.5A output isolation switch in an 8-pin µMAX® package. The IC operates from a 2.4V to 5.5V supply voltage but can boost battery voltages as low as 0.8V up to 28V.

The MAX1606 uses a unique control scheme that provides high efficiency over a wide range of load conditions. An internal 0.5A MOSFET reduces external component count, and a high switching frequency (up to 500kHz) allows for tiny surface-mount components. The current limit can be set to 500mA, 250mA, or 125mA, allowing the user to reduce the output ripple and component size in low-current applications.

Additional features include a low quiescent supply current and a true shutdown mode that saves power by disconnecting the output from the input. The MAX1606 is ideal for small LCD panels with low current requirements but can also be used in other applications. A MAX1606 evaluation kit is available to help speed up design time.

Applications

* Cell Phones/Cordless Phones * Handy Terminals * LCD Bias Generators * Organizers * Palmtop Computers * PDAs and Other Handheld Devices

* Adjustable Output Voltage up to 28V

* 20mA at 20V from a Single Li+ Battery

* True Shutdown (Output Disconnected from Input)

* Output Short-Circuit Protection

* 88% Efficiency

* Up to 500kHz Switching Frequency

* Selectable Inductor Current Limit (125mA, 250mA, or 500mA)

* 0.1µA Shutdown Current

* 8-Pin µMAX Package